Beep.h

00001 #ifndef MBED_BEEP_H
00002 #define MBED_BEEP_H
00003 
00004 #include "mbed.h"
00005 
00006 /** class to make sound with a buzzer, based on a PwmOut
00007  *   The class use a timeout to switch off the sound  - it is not blocking while making noise
00008  *
00009  * Example:
00010  * @code
00011  * // Beep with 1Khz for 0.5 seconds
00012  * #include "mbed.h"
00013  * #include "beep.h"
00014  * 
00015  * Beep buzzer(p21);
00016  * 
00017  * int main() {
00018  *        ...
00019  *   buzzer.beep(1000,0.5);    
00020  *       ...
00021  * }
00022  * @endcode
00023  */
00024 
00025 
00026 namespace mbed {
00027 
00028 /* Class: Beep
00029  *  A class witch uses pwm to controle a beeper to generate sounds.
00030  */
00031 class Beep {
00032 
00033 public:
00034 
00035 /** Create a Beep object connected to the specified PwmOut pin
00036  *
00037  * @param pin PwmOut pin to connect to 
00038  */
00039     Beep (PinName pin);
00040 
00041 /** Beep with given frequency and duration.
00042  *
00043  * @param frequency - the frequency of the tone in Hz
00044  * @param time - the duration of the tone in seconds
00045  */
00046     void beep (float frequency, float time);
00047 
00048 /** stop the beep instantaneous 
00049  * usually not used 
00050  */
00051     void nobeep();
00052 
00053 private :
00054     PwmOut _pwm;
00055     Timeout toff;
00056 };
00057 
00058 }
00059 #endif